Multi-channel filter
A filter and multi-channel technology, applied in the field of electronics, can solve the problems of large size, high cost, complex process, etc., and achieve the effect of optimizing the design process, reducing size, and reducing process cost
Active Publication Date: 2020-11-27
ROFS MICROSYST TIANJIN CO LTD
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Problems solved by technology
Such an implementation method has complicated process, high cost and large size, which is not conducive to miniaturization.
Method used
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Embodiment Construction
[0035] image 3 It is a schematic diagram of the circuit principle of the dual-channel filter according to Embodiment 1 of the present invention. Such as image 3 As shown, the filter corresponds to the situation of M=2 and N=2. Specifically, the filter is a ladder-type 5-4 structure, including one series branch and four parallel branches. The acoustic wave resonators are connected in series in sequence, and then connected between port 1 and port 2. The first-stage bulk acoustic wave resonator of the series branch is composed of two resonators S11 and S21 connected in parallel, and the second-stage bulk acoustic wave resonator of the series branch is composed of Two resonators S12 and S22 are connected in parallel. The third-level BAW resonator of the series branch is composed of two resonators S13 and S23 in parallel. Similarly, the fourth and fifth BAW resonators of the series branch are respectively composed of resonator S14 , S15 and S24, S25 are connected in parallel. ...
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The present invention provides a multi-channel filter, comprising a first part of the resonator and a second part of the resonator, each of the two parts of the resonator includes M resonator groups, the first part of the resonator constitutes a series part of the filter, and the series part includes 2N +1 parallel body connected in series between the input and output of the filter, each resonator in each parallel body comes from a different resonator group; the second part of the resonators constitutes the parallel part of the filter, the parallel The part includes N hybrids; the series branch in the hybrid and the M resonators in any one parallel branch come from different resonator groups; the series resonant frequency of each group of resonators in the first part, They are respectively equal to the parallel resonance frequencies of the groups of resonators in the second part in one-to-one correspondence. Adopting the technical solution of the present invention realizes the technical solution of realizing dual channels or even multiple channels with one wafer, which helps to optimize the design process, reduce the process cost, and reduce the size of the filter.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a multi-channel filter. Background technique [0002] With the development of wireless communication technology, people have higher and higher requirements for data transmission rate. Corresponding to the data transmission rate is the high utilization rate of spectrum resources and the complexity of spectrum. The complexity of the communication protocol puts forward strict requirements on the performance of each module of the RF system. In the RF front-end module, the RF filter plays a vital role. It can filter out out-of-band interference and noise to meet the requirements of the RF system and The communication protocol requires the signal-to-noise ratio, so as to improve the communication quality and user experience. At the same time, in addition to the high requirements on the filter performance, the system also puts forward high requirements on the volume size, and the b...
Claims
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IPC IPC(8): H03H9/64
CPCH03H9/6456
Inventor 庞慰徐利军
Owner ROFS MICROSYST TIANJIN CO LTD